Dishonest when bent? (7)
I believe the answer is:
crooked
I believe this is a double definition.
'dishonest' is the first definition.
(similar in meaning)
'bent?' is the second definition.
('crooked' can be similar in meaning to 'bent')
'when' acts as a link.
(Other definitions for crooked that I've seen before include "Not straight or aligned" , "Misshapen" , "Awry - untrustworthy" , "Distorted or dishonest" , "Bent, twisted" .)